Perhaps of interest for board readers : There are some reports on this event in Russian web ( for example v1.ru and novostivolgograda.ru , but also at "thefirearmblog" or newsweek.com . That boat was sunk by Wigand Wüster's artillery battery in oct. 1942, the guns that hit the boat were conquered soviet 7,62 cm cannons . It is planned to restore and exhibit the boat in Volgograd .